Power set



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H. TREITEL '2,914,956

POWER SET Filed April 9, 1934 Inventor: Hirwr-ih Treibel,

E. 9M M bij jf/Itto Patented Sept. 17, 1935 UNITED STATES POWER SETHeinrich Treitel, Berlin, Germany, assignor to General Electric Company,a corporation of New York Application April 9, 1934, Serial No. 719,805In Germany April 13, 1933 2 Claims.

The present invention relates to power sets such as turbo-generators andhas for its object an improved construction and arrangement of suchsets.

For a consideration of what I believe to be novel and my invention,attention is directed to the following specification and the claimsappended thereto in connection with the accompanying drawing which formsa part of my specication. Y

In the single gure of the drawing I have shown a turbo-generator setsuch as may be used for lighting purposes in trains and the like.

The set comprises an electric generator I8 which may be of the directcurrent type having a shaft II supported by anti-friction bearings I2and I3. The generator is driven by an elastic fluid turbine i4 having acasing I5 with an inlet It for elastic fluid and an exhaust chamber I'I.The turbine has a single stage comprising a nozzle member I8 suitablybolted or otherwise fastened on the casing and a bucket wheel I8 securedto an overhung portion 20 of the generator shaft II. The elastic fluidis conducted from the inlet I6 through a valve chamber 2I and a channel22 forming a part of the casing to the nozzle or nozzles 23 of themember I8, whence the elastic fluid is guided in proper directiontowards the blades of the bucket wheel. Member I8 may have only a singlenozzle 23, or there may be two or more. The elastic iiuid dischargedfrom the bucket wheel flows into a chamber 24 which communicates withand forms a part of the exhaust chamber I'I having an outlet IIa. Thebucket wheel has a hub 25 secured to the overhung shaft portion 28. Apacking 26 is provided between the hub 25 and an end plate 21 of theturbine to reduce leakage of elastic fluid. The generator VI0 isprovided With a plate 28 adjacent the turbine to prevent leakage uidfrom entering the interior of the generator. The flow of elastic uid tothe turbine is controlled by a speed governing mechanism and a `va1ve inresponse to speed changes of the set. The speed governing mechanismincludes a speed governor 29 located in the exhaust chamber I'I of theturbine. The speed governor has two iiyweights 38 and 3I pivotallyconnected to brackets 32 and 33 respectively. The pivotal connectionsbetween the fly-weights and the brackets are formed by knife-edgedmembers 34 and 35 respectively. The brackets 32 and 33 are rigidlysecured to or form a part of the bucket wheel I9. Each fly-weight has anarm 36 and 31 respectively. The ends of the arms are connected to a hubof a disk 38 by means of a pivot 39. The iiy-weights are biased inwardlyby means including a tension spring 4I) connected to knife-edged members4I and 42 on the fly- 35 and 3l together with the pivot 39 moves to l0the right. This movement is transmitted to a valve mechanism to effectdecreased flow of fluid to the turbine. The Vvalve mechanism includes amovable valve member 43 secured to a shaft 44 in alinement with theshaft II of the set. The l5 shaft projects through a sleeve member 45fastened to the turbine casing. The member 45 has an opening registeringwith the aforementioned inlet I8 and defines the inlet chamber 2I andseat 45 for the valve 43.

member 45 the stem 44 is provided with packings 41 and 48. Theright-hand end portion of the sleeve member 45 is recessed to accommo-To reduce leak- 20 age of steam along the inner surface of the sleeve ydate a sleeve 49, which latter forms a part of 25 a recessed disk 58,and is rigidly secured to the valve stem 44. Movement of the speedgovernor is transmitted to the disk 50 by the rotatable plate 38 throughthe intermediary of a non-rotatable disk 5I made of hard carbon and 30held in the recess of the disk 50.

As the hard carbon disk 5I as well as the rotary disk 38 are located inthe exhaust end of the turbine where they are subjected to the erodingand corroding effects of wet steam,

provide the surface of at least one of the disks with a material whichis not affected by wet steam, or make the rotary disk 38 entirely ofsuch material. This is an important feature of my invention. shown thedisk 38 as comprising two halves, a right-hand half 52 adjacent thegovernor made of steel, and a left-hand half 53, contacting the carbondisk, made of non-corroding and noneroding material. any suitable means,for instance, soldering or brazing. A suitable material for thecontacting plate 53 I have found to be a sintered mixture of copper andWolfram. The valve stem In the present instance I have 40 The two halvesare united by 45 44 is biased towards the right by a compression 50spring 54 located in a cylindrical body 55, which latter is secured tothe turbine casing. The biasing spring 54 tends to move the Valve member43 towards its seat. A channel 56 establishes communication between theinterior of the cylin- 55 drical body 55 and the exhaust chamber l1 toeliminate or compensate end thrust on the governing mechanism.

The operation of the turbo-generator set is as follows: On increase inspeed of the generator, due to a decrease in load, eifects, as pointedout above, movement of the pivot connection 39 of the flyweight armstowards the right. The rotary disk 38 thereby is moved away from thecarbon disk 5I, permitting the biasing spring 54 to move the valvemember 43 towards its seat, resulting in a decreased flow of elasticiiuid to the turbine and accordingly a decrease in speed.

If the speed of the turbine decreases, due to an increase in load, theflyweights are moved together by the action of the governor spring 40,causing movement of the rotary disk 38 towards the left, that is againstthe carbon disk, thereby effecting opening movement of the valve member43 against the action of the biasing spring 54. The flow of fluid to theturbine thereby decreases, resulting in increased speed of the generatorand accordingly increased load output. Thus, movement of the valveduring increasing load is directly accomplished by the speed governor,Whereas movement of the valve during decreasing load is indirectlyaccomplished by the speed governor and directly by the spring 54. In thelatter case the plate 38 merely moves away from the carbon disk 5I topermit movement of the valve member 43 towards its seat by thecompression spring 54.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is:

1. In a turbo-generator set, an elastic fluid turbine having a bucketwheel and an inlet valve for controlling the flow of fluid to theturbine, said valve having a stem in alinement with the turbine shaft, aspeed governing mechanism located in the exhaust chamber of the turbineand including a speed governor having flyweights driven by the shaft, arotary disk secured to the flyweights, and means for transmittingmovement from the rotary disk to the valve comprising an axially movablecarbon plate fastened to the valve stem and a spring biasing the plateagainst the face of the rotary disk, the rotary disk being made at leastpartly of a sintered mixture of copper and Wolfram to reduce wearbetween the rotary disk and the axially movable carbon plate.

2. In a turbo-generator set, an elastic fluid turbine having a bucketwheel and an inlet valve for controlling the flow of fluid to theturbine, said valve having a stem in alinement with the turbine shaft, aspeed governing mechanism located in the exhaust chamber of the turbineand including a speed governor having fiyweights driven by the shaft, arotary disk secured to the flyweights, means for transmitting movementfrom the rotary disk to the valve, said means comprising a carbon platesecured to one end of the valve stem and a spring engaging the other endof the valve stem to bias the carbon plate against the rotary disk andmeans for compensating axial thrust on the carbon plate by the exhaustfluid.

HEINRICH 'IREITEL

